code: def setUp(self) -> None:
      image1 = {
          "file_name": "munster/munster_000102_000019_leftImg8bit.png",
          "height": 1024,
          "width": 2048,
          "segm_file": "munster/munster_000102_000019_gtFine_labelIds.png",
          "id": 0,
      }
      image2 = {
          "file_name": "munster/munster_000157_000019_leftImg8bit.png",
          "height": 1024,
          "width": 2048,
          "segm_file": "munster/munster_000157_000019_gtFine_labelIds.png",
          "id": 1,
      }
      image3 = {
          "file_name": "munster/munster_000139_000019_leftImg8bit.png",
          "height": 1024,
          "width": 2048,
          "segm_file": "munster/munster_000139_000019_gtFine_labelIds.png",
          "id": 2,
      }
      image4 = {
          "file_name": "munster/munster_000034_000019_leftImg8bit.png",
          "height": 31,
          "width": 15,
          "segm_file": "munster/munster_000034_000019_gtFine_labelIds.png",
          "id": 3,
      }
  
      images = [image1, image2, image3, image4]
  
      categories = [
          {"id": 24, "name": "person"},
          {"id": 25, "name": "rider"},
          {"id": 26, "name": "car"},
      ]
  
      annotations = [
          {
              "iscrowd": 0,
              "category_id": 24,
              "bbox": [379.0, 435.0, 52.0, 124.0],
              "area": 2595,
              "segmentation": {"size": [1024, 2048], "counts": "xxx"},
              "image_id": 0,
              "id": 0,
          },
          {
              "iscrowd": 0,
              "category_id": 25,
              "bbox": [379.0, 435.0, 52.0, 124.0],
              "area": -1,
              "segmentation": {"size": [1024, 2048], "counts": "xxx"},
              "image_id": 0,
              "id": 1,
          },
          {
              "iscrowd": 0,
              "category_id": 26,
              "bbox": [379.0, 435.0, -1, 124.0],
              "area": 2,
              "segmentation": {"size": [1024, 2048], "counts": "xxx"},
              "image_id": 0,
              "id": 2,
          },
          {
              "iscrowd": 0,
              "category_id": 24,
              "bbox": [379.0, 435.0, 52.0, -1],
              "area": 2,
              "segmentation": {"size": [1024, 2048], "counts": "xxx"},
              "image_id": 0,
              "id": 3,
          },
          {
              "iscrowd": 0,
              "category_id": 1,
              "bbox": [379.0, 435.0, 52.0, 124.0],
              "area": 2595,
              "segmentation": {"size": [1024, 2048], "counts": "xxx"},
              "image_id": 0,
              "id": 4,
          },
          {
              "iscrowd": 1,
              "category_id": 26,
              "bbox": [379.0, 435.0, 52.0, 124.0],
              "area": 2595,
              "segmentation": {"size": [1024, 2048], "counts": "xxx"},
              "image_id": 1,
              "id": 5,
          },
          {
              "iscrowd": 0,
              "category_id": 26,
              "bbox": [379.0, 435.0, 10, 2],
              "area": 2595,
              "segmentation": {"size": [1024, 2048], "counts": "xxx"},
              "image_id": 3,
              "id": 6,
          },
      ]
      fake_json = {
          "images": images,
          "annotations": annotations,
          "categories": categories,
      }
      self.json_name = "cityscapes.json"
      dump(fake_json, self.json_name)
  
      self.metainfo = dict(classes=("person", "rider", "car"))
  
file_path: mmdetection/tests/test_datasets/test_cityscapes.py
imports: import os
  import unittest
  from mmengine.fileio import dump
  from mmdet.datasets import CityscapesDataset
label_desc: Use image node_id 1 for calling the TestCityscapesDataset obj's underlying member method code with example usage: obj.setUp() without return types